CN105606916A - Method of generating grounding device test current - Google Patents
Method of generating grounding device test current Download PDFInfo
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- CN105606916A CN105606916A CN201510582073.0A CN201510582073A CN105606916A CN 105606916 A CN105606916 A CN 105606916A CN 201510582073 A CN201510582073 A CN 201510582073A CN 105606916 A CN105606916 A CN 105606916A
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- current
- earthing
- conductor
- grounding means
- electric current
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Abstract
The invention belongs to the electrical measurement technology field and discloses a method of generating a grounding device test current. One conductor is arranged to connect a tested grounding device through a lead. An insulator with static charges is arranged near the conductor. An external force is used to change a relative position of the charged insulator and the conductor so as to induce a current which flows into the ground through the grounding device. In the method of the invention, an electrostatic induction principle is used to generate a test current of the grounding device, and a current electrode and a current line do not need to be arranged. By using the method of generating the grounding device test current, a workload and intensity of test work are greatly reduced, a mutual inductance interference between the current line and a voltage line is eliminated and a current field distortion problem caused by the current electrode is avoided.
Description
Technical field
The invention belongs to electrical measurement technical field, be specifically related to a kind of method that produces earthing or grounding means measuring current.
Technical background
Earthing or grounding means is the function system of realizing power system or electrical installations in buildings, facility ground connection, comprises and being embedded in groundOne or more electric conductors and earth connection. Grounded screen be power system use have earial drainage and equal pressure effect relatively large netted concurrentlyThe general designation of earthing or grounding means. The quality of grounded screen performance will directly affect the stable operation of power system and the safety of equipment and life.The characterisitic parameter of earthing or grounding means is the macro-indicators of earthing or grounding means performance quality, mainly comprises impedance ground, place surface potential ladderDegree, contact electromotive force, step voltage be poor, shift parameter and the indexs such as current potential. The Measurement accuracy of earthing or grounding means characterisitic parameter is to connectThe basis of ground work is an important ring of grounding design, construction and operation maintenance Whole Course Management. Impedance ground is wherein heavierThe parameter of wanting, is defined as the impedance of earthing or grounding means to distant place zero potential point, is between earthing or grounding means and distant place zero potential point on numerical valuePotential difference and the ratio that passes through the electric current in earthing or grounding means inflow place. At present, measure impedance ground and generally adopt " three-electrode method ",An auxiliary current utmost point C and a potential pole P are set when measurement, two lead-out terminals of power supply are connected respectively to tested earthing or grounding meansWith electric current utmost point C, formed by earthing or grounding means, electric current line (connecting the line of power output end to electric current utmost point C), the electric current utmost point and the earthCurrent loop, the voltage V of measuring circuit electric current I and potential pole and earthing or grounding means, V/I in the time of the electric current utmost point and potential pole reasonable ArrangementBe impedance ground. " three electrodes " refers to electric current utmost point C, potential pole P and tested earthing or grounding means. This method requires electric current utmost point C away from quiltSurvey earthing or grounding means, it is right that relevant criterion requires the distance at the common electric current utmost point and tested earthing or grounding means edge to should be tested earthing or grounding means maximumThe more than 4 times of linea angulata length. It is mainly in order to provide current loop to power supply that electric current utmost point C is set. Employing arranges the method for the electric current utmost pointProvide measuring current to have following shortcoming:
(1) workload of the arrange current utmost point and electric current line is large. Because the electric current utmost point will be away from tested earthing or grounding means, generally need to placeVery long electric current line, particularly for large-scale earth mat, electric current line length can reach several kilometers, and on-the-spot realization is very difficult. In addition electricity,The stream utmost point need to be imbedded underground certain depth, and this work also takes time and effort very much.
(2), while measurement, owing to having mutual inductance between electric current line and pressure-wire, the electric current in electric current line can be in voltage measurement circuit senseShould go out voltage, this induced voltage brings additive error.
(3) electric current of the electric current utmost point can change the CURRENT DISTRIBUTION of tested earthing or grounding means to the earth diffusing, i.e. so-called current field distortion,This phenomenon also can be brought measure error.
To sum up state, due to the existence of the auxiliary current utmost point and electric current line, not only cause the workload of measurement large, time and effort consuming, andCan cause multiple measure error, these errors belong to method error, are difficult for eliminating.
Summary of the invention
The object of this invention is to provide a kind of method that produces earthing or grounding means measuring current, the method is without the auxiliary current utmost point being set alsoWithout arrange current line.
In order to achieve the above object, the technical solution used in the present invention is:
A conductor 1 is set on the ground and is connected by wire 3 with tested earthing or grounding means G, an electrical body is set near conductor 12, electrical body 2 changes under external force with the relative position of conductor 1, and (fixed conductor 1, allows electrical body 2 move, or solidDetermine electrical body 2, allow conductor 1 move), due to electrostatic induction, have electric current and inject the earth, this electricity through wire 3, earthing or grounding meansStream can be used as the measuring current of measuring earthing or grounding means characterisitic parameter.
On this basis, more according to specific needs measure characterisitic parameter arrange suitable potential pole, just can measure corresponding characteristicParameter.
Further, described electrical body 2 is the insulator with electrostatic charge.
Further, while measuring the power frequency characterisitic parameter of earthing or grounding means, allow electrical body 2 and the relative position of conductor 1 make periodically-varied,The electric current inducing is sine-wave current.
Further, while measuring the impact characteristics parameter of earthing or grounding means, allow electrical body 2 and the relative position of conductor 1 make single quickChange, the electric current inducing is dash current.
Compared with prior art, superiority of the present invention is:
(1) just can inject measuring current to earth mat without the arrange current utmost point and electric current line, saved to squeeze in ground the electric current utmost point andThe trouble of cloth discharge stream line, greatly reduces workload, has shortened measurement required time.
(2), owing to having cancelled electric current line, just do not exist electric current line to disturb the mutual inductance of voltage measurement circuit yet.
(3) owing to having cancelled the electric current utmost point, also just fundamentally solve the current field distortion problem that the electric current utmost point causes, make soilIn the definition of CURRENT DISTRIBUTION and characterisitic parameter require consistent.
Brief description of the drawings
Fig. 1 is the theory structure schematic diagram of one embodiment of the present of invention.
Detailed description of the invention
Below in conjunction with accompanying drawing and a specific embodiment, the present invention is described in further detail.
As shown in Figure 1, the conductor 1 of hollow circle tube is connected with tested earthing or grounding means G by wire 3, columniform electrical body2 external diameter is slightly less than the internal diameter of conductor 1, and conductor 1 is coaxially placed with electrical body 2, electrical body 2 edge under external forceAxis direction moves around, and conductor 1 does not contact all the time with electrical body 2. Electrical body 2 adopts insulating materials, makes its band before testNegative electrical charge or positive charge.
While measuring the power frequency characterisitic parameter of earthing or grounding means, external force promotes electrical body 2 and does periodically to move back and forth along axis, thereby bandElectricity body 2 inserts the degree of depth cyclically-varying in conductor 1, and due to electrostatic induction, the electric current I of injecting earthing or grounding means is periodically electricStream, it is sinusoidal current that the motion of rationally controlling electrical body 2 makes electric current I.
While measuring the impact characteristics parameter of earthing or grounding means, external force promotes electrical body 2 along the insertion suddenly of axis do or away from conductor 1,Due to electrostatic induction, the electric current I of injecting earthing or grounding means is dash current, and the motion of rationally controlling electrical body 2 makes electric current I symbolClose lightning impulse waveform.
On the basis of the above, then reasonable Arrangement potential pole, the voltage V between potential pole and earthing or grounding means measured, simultaneously measure traverse line 3In electric current I, finally calculate the characterisitic parameter of earthing or grounding means.
Essence of the present invention is to utilize electrostatic induction principle to produce the measuring current of earthing or grounding means. The above embodiment of the present invention is notBe limiting the scope of the present invention, all equivalences that Spirit Essence is done according to the present invention change, the guarantor that all should drop on this patentWithin protecting scope.
Claims (4)
1. a method that produces earthing or grounding means measuring current, is characterized in that, one or more conductors (1) is set with testedEarthing or grounding means is connected by wire, then near conductor (1), one or more electrical bodies (2) is set, and uses external force to change chargedBody (2) and conductor (1) thus relative position induce the electric current that injects the earth by earthing or grounding means.
2. a kind of method that produces earthing or grounding means measuring current according to claim 1, is characterized in that, described is chargedBody (2) is the insulator with electrostatic charge.
3. a kind of method that produces earthing or grounding means measuring current according to claim 1, is characterized in that, electrical body (2)With the relative position of conductor (1) be periodic variation, the electric current inducing is sine-wave current, for testing earthing or grounding meansPower frequency characteristic.
4. a kind of method that produces earthing or grounding means measuring current according to claim 1, is characterized in that, electrical body (2)With the change of conductor (1) relative position be that single changes fast, the electric current inducing is dash current, for testing earthing or grounding meansImpact characteristics.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510582073.0A CN105606916A (en) | 2015-09-14 | 2015-09-14 | Method of generating grounding device test current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510582073.0A CN105606916A (en) | 2015-09-14 | 2015-09-14 | Method of generating grounding device test current |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105606916A true CN105606916A (en) | 2016-05-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510582073.0A Pending CN105606916A (en) | 2015-09-14 | 2015-09-14 | Method of generating grounding device test current |
Country Status (1)
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| CN (1) | CN105606916A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110208637A (en) * | 2019-06-20 | 2019-09-06 | 国网天津市电力公司电力科学研究院 | A kind of isolated on-Line Monitor Device and its method of DC bushing end shield ground connection |
-
2015
- 2015-09-14 CN CN201510582073.0A patent/CN105606916A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110208637A (en) * | 2019-06-20 | 2019-09-06 | 国网天津市电力公司电力科学研究院 | A kind of isolated on-Line Monitor Device and its method of DC bushing end shield ground connection |
| CN110208637B (en) * | 2019-06-20 | 2021-04-20 | 国网天津市电力公司电力科学研究院 | Isolated online monitoring device and method for direct-current bushing tap grounding |
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Legal Events
| Date | Code | Title | Description |
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| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20160525 |
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| WD01 | Invention patent application deemed withdrawn after publication |